Process Diagram

Band 9: The diagram below shows how one type of coal is used to produce electricity.

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Image for topic: The diagram below shows how one type of coal is used to produce electricity.

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The image depicts the process of making electricity from coal, starting with a mine where coal is extracted, followed by a crusher that breaks the coal into smaller pieces, then transportation of coal to a gasifier. The gasifier converts coal into gas, which goes through a cooler before reaching the gas power plant. The gas power plant generates electricity that is distributed to houses and industries, while also producing heat waste. Solid waste is shown as a byproduct of the cooler.

Given the complexity of the image, the above description may not be entirely accurate.

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The diagrams illustrate how electricity is produced from coal.

Overall, this is a man-made linear process that uses coal as a fossil fuel to generate electricity. The process consists of several stages, beginning with the extraction of coal from a mine and ending with the distribution of electricity to households and industries.

Initially, coal is extracted from the mine and subsequently crushed into smaller pieces. These pieces are then fed into a gasifier, where they are heated and converted into gas. The resulting gas is then transferred to a cooling unit, where it is cooled to lower its temperature and separated from the waste heat.

Afterwards, the cooled gas undergoes a cleaning process to remove any remaining impurities and harmful substances. The purified gas is then transferred to a gas power plant, where it is used to generate electricity, with excess heat being released during the process. Finally, the electricity generated is supplied to households and industries, where it can be used for a variety of domestic and industrial purposes.

Word Count: 170

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Overall Band Score

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Vocabulary Complexity:
C2 - Complex
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Grammar Mistakes: N/A

Vocabulary Repetition:

electricity: 5

process: 4

where: 4

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Task Response

The report effectively addresses the task by describing the process of generating electricity from coal. It provides a clear overview and logically sequences the stages. However, there is a minor inaccuracy: the report mentions a cleaning process for the gas, which is not explicitly described in the visual information. Additionally, the report omits the mention of solid waste as a byproduct of the cooler. To improve, ensure all key stages and byproducts from the visual are accurately represented without adding unverified steps.

Coherence & Cohesion

The report is exceptionally well-organized and easy to follow. The information flows logically from the initial extraction of coal to the final distribution of electricity. The use of cohesive devices such as 'Initially', 'Afterwards', and 'Finally' guides the reader smoothly through the process without being obtrusive. Paragraphing is skillfully managed, with a clear overview followed by a detailed description of each stage.

Lexical Resource

The vocabulary used is precise, varied, and appropriate for the task. Words like 'extracted', 'crushed', 'fed into', 'converted', 'transferred', 'cooling unit', 'purified', and 'supplied' demonstrate a strong command of lexical features related to processes. The phrasing is natural and sophisticated, with no noticeable errors or awkwardness.

Grammatical Range & Accuracy

The report demonstrates a wide range of grammatical structures used with full flexibility and control. Sentences are varied in length and complexity, including passive constructions ('is extracted', 'are then fed', 'is then transferred'), relative clauses ('where they are heated'), and participial phrases ('with excess heat being released'). Punctuation and grammar are used correctly throughout, contributing to the clarity and professionalism of the report.

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